﻿/*
 * Copyright (c) 2011 Shawn Rakowski
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to 
 * deal in the Software without restriction, including without limitation the 
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 
 * sell copies of the Software, and to permit persons to whom the Software is 
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in 
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 
 * SOFTWARE. 
 * 
 */

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ROS.Application.DomainObjects
{
    internal class OrderItem : DomainObject
    {
        #region Fields

        private long id;        
        private int quantity;
        private Money unitPrice;
        private MenuItem menuItem;

        #endregion

        #region Properties

        /// <summary>
        /// Gets or sets the ID of this OrderItem.
        /// </summary>       
        public long ID
        {
            get { return id; }
            set { id = value; }
        }

        /// <summary>
        /// Get or sets the quantity of the MenuItem on this order item.
        /// </summary>
        public int Quantity
        {
            get { return quantity; }
            set { quantity = value; }
        }

        /// <summary>
        /// Gets or sets the UnitPrice, that is, how much does this menu item cost per
        /// quantity of 1. The Price of the MenuItem can change over time. This is copied
        /// to ensure the price stays as what is was when it was added to the order.
        /// </summary>
        public Money UnitPrice
        {
            get { return unitPrice; }
            set { unitPrice = value; }
        }

        /// <summary>
        /// Gets the total price for this line item, basically Quantity*Price.
        /// </summary>
        public Money Price
        {
            get
            {
                return calculatePrice();
            }
        }

        /// <summary>
        /// Get or set the menu item associated with this OrderItem.
        /// </summary>
        public MenuItem MenuItem
        {
            get { return menuItem; }
            set { menuItem = value; }
        }

        #endregion

        #region Constructor

        /// <summary>
        /// Construct a new OrderItem object.
        /// </summary>
        public OrderItem()
        {
            id = 0;
            quantity = 0;
            unitPrice = null;
            menuItem = null;
        }

        #endregion

        #region Methods

        /// <summary>
        /// Calculate the actual price of this order. That is, given a particular quantity
        /// and unit price, what is the total price for this order item.
        /// </summary>
        /// <returns></returns>
        private Money calculatePrice()
        {
            return quantity * unitPrice;
        }

        #endregion
    }
}
